PHP str_rot13() Function

The PHP str_rot13() function performs the ROT13 encoding on the string argument and returns the resulting string.

The ROT13 encoding simply shifts every letter by 13 places in the alphabet while leaving non-alpha characters untouched. Encoding and decoding are done by the same function. Passing an encoded string as argument to this function returns the original version.

Syntax

str_rot13(string)

Parameters

Return Value

Returns the ROT13 version of the given string.

Example:

The example below shows the usage of str_rot13() function.

<?php
$str = "Hello World!";

//encoding the str
$encode_str = str_rot13($str);
//decoding the encoded string
$decode_str = str_rot13($encode_str);

echo "The string is: $str \n";
echo "Encoded string is: $encode_str \n";
echo "Decoding encoded string: $decode_str \n";
?>

The output of the above code will be:

The string is: Hello World! 
Encoded string is: Uryyb Jbeyq! 
Decoding encoded string: Hello World!